Author Topic: 70 Challenger still not running .  (Read 132 times)

Offline BadJoey

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70 Challenger still not running .
« on: September 18, 2021 - 06:37:19 AM »
Hi guys .Around March 2021 I had a brain storm (satire) I put in a aluminum radiator  and 2 electic fans . Boy am I sorry . About 6 miles from house I had to turn around . Car hasn't moved since .After checking everything I could think of I found a number of burned wires which I replaced . Now summer is as good as over ' and car is still not running . Some times I have power to ballast resistors s some times nothing . One time when trying to start car balast, coil and voltage regulator were all hot as heck .The way it seems now I have power the coil somes times nothing . I changed the 2 column wire harness with 2 I had laying around .Nothing changed .Trying to check coil no sprark till I released the key then one small spark .I ran a jummper wire to by pass the the red wire out of the coloumn thats always been a problem .A couple of friends looked at it nothing new .  I can not drop car any place unless they keep it locked up inside a garage at night .Not to mention towing it to shop .I cant stand it not running . This whole summer was a waste . I've had some issues I can't up with that was a little moe important . Any help would be greatly appreciated I am just about out of ideas.                                                                                       
« Last Edit: September 18, 2021 - 06:41:30 AM by BadJoey »




Online 70chall440

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Re: 70 Challenger still not running .
« Reply #1 on: September 23, 2021 - 12:28:40 AM »
This is a bit hard to diagnose via the internet, however what I would tell you is that electrical issues are not magical, they are either right or they are not, however there are a lot of variables such as connections, inner wire condition, etc. You need to isolate the start and run circuits and follow each carefully and ensure that all of the connections are good, clean and power is able to flow.

I would start with a new ballast resistor and coil so that I minimize the possibility that you are sealing with bad components (new doesn't mean good though). You should have a good DMM and I highly recommend getting a Power Probe which will allow you to put power to a circuit (wire) or determine if there is power there.

I am a bit confused by your opening statement about the fans, what do they have to do with your starting/running circuits? Did you put in a relay to control the fans? Where did you connect the fans? The only way the fans could have affected the car starting/running is if you connected them into one of those circuits and they were not fused thus overloading one of the circuits.

Some things to check off the top of my head;

all of your grounds
all of your connections
already mentioned the BR and Coil
your fusible link
all of your fuses
not sure if you are using points or electronic ignition but if you are using the electronic ignition, make sure it is grounded, in fact I would probably test it and/or replace it.

While electrics are not magical or rocket science, there are definitely things that should not be done ranging from using the correct size and type of wire, clean and secure connections, etc.

I know you are depressed and feeling helpless but it isn't that complicated and I would bet that what ever it is it's small unless you fried something hard. Have you tried starting it by turning the key to the on position and jumping the starter relay?
Current Mopar
70 Challenger RT 440-6 EFI, 73 Cuda 416-6 EFI
05 Hemi Durango, 01 Ram 4x4, 14 Ram 2500 4X4, 10 PCP Challenger 6 spd RT, 01 Viper GTS ACR, 52 B3B w/330 Desoto Hemi, 70 Hemi RR (under const)
Past Mopars
9 x Challengers. AAR Cuda, 4 RR, 2 GTX, 4 Chargers, etc... (too many to list)

Offline BadJoey

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Re: 70 Challenger still not running .
« Reply #2 on: September 23, 2021 - 05:09:04 AM »
Good morning Chall 70Chall440. I already tried the the things you listed but could not find the problem . The fan kit came with relays which I installed wrong .If you were in front of
 the car looking at the fire wall where the wires go through . The top right cornerer keeps flashing like it was a coil wire . my wire is tan .I have a factory electronic ignition kit I installed years ago . At this moment I have not hooked up the tan wire yet I read sum where that the ballast resistor is built into  the coil after 70 . and no need for a ballast after 1970 , Not sure if that is correct or not . the tan wire spark looks weak but if you push hard on the test light it flashes . That the first thing on my list today .Is there a easy way to clean the female end of the connection ? I changed ballast, coil ,voltage regulator and electronic ing box . 3 or 4 times .Does the coil wire start flashing after reaching the coil or before ? Well cross your fingers for me .There is a air condition relay that keeps trying to blow horn at the top of fuse panel I do not have A/C .
« Last Edit: September 23, 2021 - 05:15:14 AM by BadJoey »

Online 70chall440

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Re: 70 Challenger still not running .
« Reply #3 on: September 24, 2021 - 12:14:48 PM »
BadJoey - I have no idea what you have going on there but it surely sounds like a mess. No, there isn't a ballast resistor built into the coil, never has been. Not sure where you go that info from but it is completely wrong. There should be 2 wires going to the Ballast Resistor, a tan wire and a blue wire; one is for the start circuit and one is for the run circuit and both need to be connected and functional.

I have no idea what "AC relay" you are talking about, I have never heard of that and even if it is there is should not have anything to do with your horn.

Look, you need to get a factory wiring diagram and start tracing wires. This is not a complicated system so you should be able to trace/track wires and get it wired correctly.

I am not sure where you are but perhaps its time to bring in someone with more experience to sort this out. You have to establish a base line. I am not sure how you messed up the fan relays, they are pretty straightforward.
Current Mopar
70 Challenger RT 440-6 EFI, 73 Cuda 416-6 EFI
05 Hemi Durango, 01 Ram 4x4, 14 Ram 2500 4X4, 10 PCP Challenger 6 spd RT, 01 Viper GTS ACR, 52 B3B w/330 Desoto Hemi, 70 Hemi RR (under const)
Past Mopars
9 x Challengers. AAR Cuda, 4 RR, 2 GTX, 4 Chargers, etc... (too many to list)

Online 70chall440

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Re: 70 Challenger still not running .
« Reply #4 on: September 24, 2021 - 12:23:48 PM »
I am not trying to be mean or trying to belittle you but it seems that you do not have a basic understanding of electricity or electrical systems (which is a common thing even among very experienced car builders). Smart guys know their limitations and either take the time to develop an understanding or get someone else to help out. There is no shame in asking for help and when it comes to an electrical system, it is entirely possible to create a situation that will burn your car to the ground.
Current Mopar
70 Challenger RT 440-6 EFI, 73 Cuda 416-6 EFI
05 Hemi Durango, 01 Ram 4x4, 14 Ram 2500 4X4, 10 PCP Challenger 6 spd RT, 01 Viper GTS ACR, 52 B3B w/330 Desoto Hemi, 70 Hemi RR (under const)
Past Mopars
9 x Challengers. AAR Cuda, 4 RR, 2 GTX, 4 Chargers, etc... (too many to list)

Offline BadJoey

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Re: 70 Challenger still not running .
« Reply #5 on: September 28, 2021 - 01:15:15 AM »
For starters I think I know some auto electric . I have had my car since 1983 . It came to me as a roller and I have never had to send car out .May be you dont know as much as you think .For starters I do not leave my car any place over night to get beat up on . The only auto elect garage in my home town is full . Can you believe a big box repair store I use for inspections and so on gets like $160,00 dollars per hour . Sign on wall says $80 dollars per half hour .If you are not helping don't throw rocks my way . I am well aware of my limits and sooner or later I;ll figue this out . As you can see by low replys auto electric is hard to track down sometimes . If you can't help don't try to discourage me . Things are always easy when it is some one elese .As for the AC relay look in the upper corner  of your fuse panel and there is a silver box which is idenified by my chiltons manule .                                                   
« Last Edit: September 28, 2021 - 01:24:26 AM by BadJoey »

Online 70chall440

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Re: 70 Challenger still not running .
« Reply #6 on: September 28, 2021 - 04:41:30 PM »
First things first, I am not trying to discourage you at all but you are asking for help on this forum and not really providing any clear explanation of the situation (which I know can be difficult when dealing with electrical issues).

Next, the fact that you built the car from a roller is commendable but I don't know what leaving the car outside has to do with any of this as I never said or hinted at anything like this. I get it that you don't want to take the car to anyone and given that you don't have someone locally available is an issue. I wasn't trying to say that you can't do it, I was trying to offer you an option for situation that you seemed to be stuck at. I don't take my cars to anyone else either so I completely get it.

As to me not knowing as much as I think I do, the same can be said about pretty much every human however I have owned well over 100 vehicles (vast majority of them being Mopars), been working on Mopars since 1975, have built a number of cars from the ground up (am building a 69 Ply Wagon for a client now, have a 70 Roadrunner to build for another client wailing which will be a complete build, have my 71 Charger that getting a 5.7/5spd which is a complete build waiting along with my 70 Roadrunner which also another complete build), designed and built my own wiring harnesses, etc. so I am pretty sure I know what I know.

Now with all of that out of the way, perhaps we can attempt to move forward....

From what you have written I understand you have the following problems;

1. the car will not start? Will it turn over?
2. something to do with a A/C relay making the horn go off? From what I can see on the wiring diagram there isn't a AC relay, there is a horn relay and possibly a time delay relay for the headlights (if so optioned). Given that the horn is going off I think we are talking about the horn relay.

Just an FYI, a Chiltons manual is great for many things but not so much when it comes to electrical, you really need the Factory Service Manual which you can get for free from www.mymopar.com (download).

Its unfortunate that this site doesn't take pictures which would be helpful, but it is what it is. If you don't want my help, so be it
Current Mopar
70 Challenger RT 440-6 EFI, 73 Cuda 416-6 EFI
05 Hemi Durango, 01 Ram 4x4, 14 Ram 2500 4X4, 10 PCP Challenger 6 spd RT, 01 Viper GTS ACR, 52 B3B w/330 Desoto Hemi, 70 Hemi RR (under const)
Past Mopars
9 x Challengers. AAR Cuda, 4 RR, 2 GTX, 4 Chargers, etc... (too many to list)